In a separate incident, six people were killed after gunmen raided two jewelry stores in northeastern Baghdad, police said.

The mayor was not in his office at the time of the attack, which occurred early Monday in al-Dhuloiya, a predominantly Sunni town in Salaheddin province about 70 kilometers (45 miles) north of Baghdad.

Later Monday, gunmen robbed a pair of jewelry stores in the northeastern Baghdad neighborhood of al-Shaab before getting into a 15-minute shootout with police.

Gunmen killed two people inside the stores. Four people were killed during clashes with police, including two officers and two civilians, police said. Ten people were injured.